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Add step-by-step guide to add syntax tests, see #1211

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@@ -23,9 +23,43 @@ in the `.sublime-syntax` format.
5. Use `bat --list-languages` to check if the new languages are available.
6. If you send a pull request with your changes, please do *not* include the changed `syntaxes.bin`
6. Add a syntax test for the new language. See [#Syntax-tests](below) for details.
7. If you send a pull request with your changes, please do *not* include the changed `syntaxes.bin`
file. A new binary cache file will be created once before every new release of `bat`.
### Syntax tests
`bat` has a set of syntax highlighting regression tests in `tests/syntax-tests`. The main idea is
make sure that we do not run into issues we had in the past where either (1) syntax highlighting
for some language is suddenly not working anymore or (2) `bat` suddenly crashes for some input (due
to `regex` incompatibilities between `syntect` and Sublime Text).
In order to add a new test file, please follow these steps (let's take "Ruby" as an example):
1. Make sure that you are running the **latest version of `bat`** and that `bat` is available on
the path.
2. Find an example Ruby source file or write one yourself. If possible, the file should aim to be
"comprehensive" (i.e. include a lot of the possible syntax), but this is not strictly necessary.
A simple file is better than none at all. Also, the files shouldn't be gigantic.
3. Save the file in `tests/syntax-tests/source/Ruby` (adapt for your language). The file name could
be `test.rb` (adapt extension) but can also be adapted if that is necessary in order for `bat` to
highlight it correctly (e.g. `Makefile`).
4. If you have copied the file from somewhere else, please make sure that the file *may* be copied
under the respective license and that the license is compatible with `bat`s license. If it
requires attribution, please add a `LICENSE.md` in the same folder with a text like this:
```
The `test.rb` file has been added from [enter source here] under the following license:
[add license text here]
```
5. Go to `tests/syntax-tests` and run the `update.sh` Bash script. A new file should be generated
in the `highlighted` folder (e.g. `highlighted/Ruby/test.rb`).
6. Use `cat` or `bat --language=txt` to display the content of this file and make sure that the
syntax highlighting looks correct.
7. `git add` the new files in the `source` folder as well as the autogenerated files in the
`highlighted` folder.
### Troubleshooting
Make sure that the local cache does not interfere with the internally stored syntaxes and